This is the GHEA 30-45mm Aluminum Ride Height Gauge. This 7075-T6 aluminum gauge is lightweight and is uniquely easy to identify. Designed to measure heights from 30-45mm, the gauge twists, rotating in 1mm increments to increase or decrease in height. With its small and lightweight size, this gauge will store easily and can be used even easier. Available in a silver, red or blue anodized finish.